You could always just send them a link to a meeting on https://meet.jit.si https://meet.jit.si -- Jitsi Meet is open-source, and doesn't require a Google Accoun

You could always just send them a link to a meeting on https://meet.jit.si https://meet.jit.si -- Jitsi Meet is open-source, and doesn't require a Google Account. It's also pretty high-quality, which is nice. And if you want to be extra security-conscious, you can just run your own instance.